László L. Lippai ,  Mental Health Surveys on Community and Organizational Levels: Challenges, Issues, Conclusions and Possibilities.   journal   = {International Journal of Psychological and Behavioral Sciences}, [online]. World Academy of Science, Engineering and Technology.
    April 2016, vol. 114(6). 1880 - 1887
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/10004581.